🚀 Speed Converter

Convert between miles per hour, kilometers per hour, knots, meters per second and feet per second. Useful for driving abroad, aviation, sailing and physics — 1 mph = 1.60934 km/h exactly.

From

1 m/s = 3.6 km/h

Precision

1 meters per second = 3.6 kilometers per hour

1 × 3.6 = 3.6

1 m/s equals 3.6 km/h, so multiplying by 3.6 converts the value. The result describes the exact same quantity — only the measuring stick changes.

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All speed units

Unit	Symbol	Definition
Meter per second	m/s	Meters per second (m/s) is the SI unit of speed. Physics calculations and wind speeds in scientific contexts use m/s; 1 m/s equals exactly 3.6 km/h.
Kilometer per hour	km/h	Kilometers per hour (km/h) is the standard road-speed unit in most countries. 100 km/h equals 62.14 mph or 27.78 m/s.
Mile per hour	mph	Miles per hour (mph) is the road-speed unit of the United States and United Kingdom. 1 mph is exactly 1.609344 km/h.
Knot	kn	A knot (kn) is one nautical mile per hour, exactly 1.852 km/h. Aircraft, ships and wind speeds in meteorology are measured in knots.
Foot per second	ft/s	Feet per second (ft/s) is a US customary speed unit, exactly 0.3048 m/s. Projectile velocities and some engineering specs use ft/s.
Mach (sea level)	Ma	Mach number expresses speed relative to the speed of sound — Mach 1 ≈ 340.29 m/s (1,225 km/h) at sea level and 15 °C. The true value varies with altitude and temperature.